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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25/15 = 5.25/x // - 5.25/x
0.25/15-(5.25/x) = 0
0.25/15-5.25*x^-1 = 0
-5.25*x^-1 = -0.01666667 // : -5.25
x^-1 = 0.0031746
-1 < 0
1/(x^1) = 0.0031746 // * x^1
1 = 0.0031746*x^1 // : 0.0031746
315.000315 = x^1
x = 315.000315
x = 315.000315
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